Method of making tap wrenches



Aug. 25, 1942. A. TALCH 2,293,866

METHOD OF MAKING TAP WRENCHES Filed April 8, 1941 Patented Aug. 25, 1942 UNITED STATES- 'PATT OFFICE 2 Claims.-

The present invention. relates to a method of making a tap wrench.

The primary object of the invention is to provide a tap wrench, the framework of which is formed of cold roll steel which has applied thereto: a coating of aluminum or plastic material by a moulding process whereby the finished product will be a tap wrench superior in quality to similarwrenches at present being manufactured.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure l is a top plan view illustrating the tap wrench in the lower section of a mould prior to its removal therefrom.

Figure 2 is a horizontal sectional view taken. substantially on line 22 of Figure 1.

Figure 3 is a sectional view taken substantially on line 3-3 of Figure 1.

Figure 4 is a top plan view of the framework as it appears before placement in the mould.

Figure 5 is a perspective view of the stationary jaw forming a part of the wrench,

Figure 6 is a perspective view of the'movable jaw of the wrench.

Figure 7 is a top plan View of the finished wrench.

Briefly described, in accordance with the present invention, the method comprises the formation of a rectangular frame of cold roll steel, or any other metal, having bars extending outwardly from diagonally opposite corners thereof to provide handles. A pair of jaws are positioned within the frame with one jaw being movable relative to the other. The entire framework including the jaws is then placed in a suitable mould whereby all parts thereof with the exception of the inner faces are coated with a plastic substance such as aluminum or the like and after the coated substance has hardened, the article is removed from the mould and polished to present the finished article shown in Figure '7.

Referring to the drawing for a more detailed description thereof, the frame of the wrench is generally designated in Figure of the drawing by the reference numeral l3, said frame being of rectangular formation having bars II and I2 extending outwardly from diagonally opposite corners. The frame I!) comprises members l3, l4 and I5, each of which is substantially squareshaped in cross section. The member I 3 forms an end and side wall l6 and I1, respectively, while the member It forms a side wall l8, and the member I5 forms the other end wall. The members 13 and M are welded or otherwise united as indicated at l9 and the end I5 is welded or otherwise united with the members I3 and M at the points 20 and 2|. The angularity of the bars II and I2 is such that they extend outwardly from diagonally opposite corners 22 and 23 of the frame. The jaw 26 shown in Figure 5 of the drawing, is disposed in the frame so as to be fixedly secured therein adjacent the end I 6, while the jaw 21, shown in Figure 6 is slidably held in the frame. The jaws 2'3 and 21 are formed with V-shaped grooves 28 on opposed sides thereof which engage the portions 29,. thejaw 21*adapted' for slidable movement thereon. The jaw 21 is actuated by means of a threaded bolt 30 which is carried in a threaded recess formed in the end l5.

As afore indicated, the jaw 26 is fixedly held within the frame l0 and as more particularly shown in Figure 5 of the drawing, said jaw is formed with vertically disposed grooves 3| on opposed sides thereof which are adapted to be filled with the coating material. When the material is poured into the mould, it finds its way into these notches with the result that after cooling the jaw is held tightly in position.

After formation of the frame and prior to the welding of the end member |5,'the jaws 26 and 21 are positioned therein after which welding of the end I 5 takes place. The entire frame is then ready to be placed into the mould generally designated by the reference numeral 32, said mould comprising upper and lower sections 33 and 34,

respectively, having recesses on their meeting faces of the general shape and contour of the frame I9. With the frame positioned in the mould and the sections 33 and 34 clamped together, the aluminum or similar material with which the frame is to be coated is poured through an appropriate opening 35 formed in the mould for disposition about the frame. The mould is constructed in such a manner, however, that the upper and lower faces of the jaws 26 and 21 will not come in contact with the material and also the portion 29 on the inside of the frame will be free from the substance. As afore indicated, however, a certain amount of the material will find its way into the notches 3| which will subsequently harden for retaining the jaw 26 in fixed position within the frame.

After the material has had a sufficient amount of time in which to cool and harden, the mould sections are separated and the moulded article removed therefrom after which it is subsequently polished to present an article having the appearance of that shown in Figure 7. The manner in which the material is prevented from contact with the portion 29 of the frame is shown in Figure 3 of the drawing, the material being applied to the frame is indicated by the numeral 36.

From the above description when taken in connection with the accompanying drawing, it will be readily apparent that a tap wrench of novel formation has been designed including a substantially rectangular shaped frame formed of cold roll steel in which the frame comprises separable members which, when united, present bars extending outwardly from diagonally opposite corners thereof. The coating of aluminum or similar material will materially strengthen the tool and at the same time greatly improve the general appearance thereof. A tap wrench constructed in accordance, with the present invention is of sturdy construction and unusually durable in use. The relation of the sliding jaw 4 relative to the fixed jaw permits the wrench to beused with taps of various sizes and shapes thereby adding to the general practicability of the tool. I

,Also' it will be understood, of course, by. those skilled in the .art that variations in the hereinabove described device involving the substitution of substantial equivalents for the devices described are intended to be comprehended within the spiritof thepresent invention and that the invention, is capable of extended application and is not confined to, the exact showing of the drawing nor to the precise construction described and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

What is claimed is:

1. The method of making a tap wrench which comprises shaping a pair of metallic bars to form the opposed longitudinal sections and one end section of a rectangular body and handle extensions projecting from diametrically opposed corners of the body, connecting a short metallic piece to the open end portion of the body to complete the same, mounting a pair of complementary jaws in the said rectangular shaped body, and casting a coating of finishing metal on the said bar structure so as to fix one of the jaws and to dispose the complementary jaw for longitudinal movement in the body with reference to thefixed jaw.

2. The method of making a tap wrench which comprises bending a metallic bar of square cross section to form a longitudinal body member, a transverse body extension and a handle portion, bending a second bar to form a lonigtudinal body member and a handle portion, welding the outer endof the said transverse body extension to the said second bar at the juncture ofjthe body member and handle portion thereof, welding a relatively short bar tothe outer end of i the body member of the said secondbar and to the juncture of the longitudinal body member and handle portion ofthe first bar. so as to provide an elongated rectangular shaped body having aligned handle portions projecting from diagonally opposed corners thereof,,the' i ner portions of the side bars providing tapered guide; ridges at the inner sides thereof, mounting a pair of co-acting jaw members onthevsaid ridges, whereby one of the said jaw membersis slidabl longitudinally on the ridges, and castin'gfa coating of finishing metal on the said body and handle portions and one of the jaws.

ALBERT TALC'H. 

